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Investigation of the electrochemical properties of layered double hydroxides : operando advanced analysis of ionic transfer mechanisms

Abstract : In the past decades, layered double hydroxides (LDHs) attracted increasing interest for their abilities of ion entrapment, containment and controlled release, with the potential to generate promising applications like energy storage, drug delivery and water treatment, in a sustainable way. This Ph.D. thesis aims at controlling in a reversible manner ion/solvent transfers by electrochemistry and at deepening the understanding of the mechanisms and kinetics related to these transfers. This was realized by means of conventional techniques coupling electrochemical and gravimetric measurements as well as a non-conventional technique, specifically the electrochemical impedance spectroscopy coupled to fast quartz crystal microbalance, also called ac-electrogravimetry. Many information could be obtained: identification and kinetics of the different contributions related to the charged and non-charged species involved in the electrochemical processes (anions, cations and solvent) and variation of the relative concentrations of the species inside the LDH. For the first time, developing and coupling operando XRD to gravimetric and current measurements under cycling potential at synchrotron (Saclay, France) underlined non reversible catalyzed oxygen evolution reaction that (i) plays a role inside the interlayered spacing and (ii) has an impact on the cation electrosorption/desorption phenomenon onto the external surface.
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Submitted on : Friday, October 22, 2021 - 3:58:11 PM
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  • HAL Id : tel-03396165, version 1

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Elise Duquesne. Investigation of the electrochemical properties of layered double hydroxides : operando advanced analysis of ionic transfer mechanisms. Analytical chemistry. Sorbonne Université, 2019. English. ⟨NNT : 2019SORUS651⟩. ⟨tel-03396165⟩

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